Burglar-alarm



(ModeL) 2 SheetsSh.eet.l.

M. DECKER-8a J. KQDEMING.

'B-URGLAR ALARM.

I Patented 001;. 17, 1882.

(Model.) 2 Sheets-Sheet M. DEG'KER & J. K. DEMING.

BURGLAR ALARM. N0. 266, 252. Patented 00t.1'7,1882,.

Inventa 2 wed g L N. PETERs. Phclo-Lilhngnphur. Wishhlglon. D. C.

Ilnrrnn terns PAT NT Eric,

MARCELLUS DECKER AND JAMES K. DEMING, OF CHICAGO, ILLINOIS.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 266,252, dated October1'7, 1882,

Application filed June 5, 1882.

T all whom it may concern Be it known that we, MARCELLUS DECKER andJAMES K. DEMING, citizens of the United States, residing at Chicago, inthe county of Cook and State of Illinois, have invented certain new anduseful Improvements in Burglar- Alarms; and we do hereby declare the.following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

The object of our invention is the construction of a burglar-alarm thatcan be applied to any door, and which will be an effective safeguardagainst sneak-thieves and tramps.

It consists of a combination of door-spindle, dogs, springs, ratchets,an alarm-bell, properly-formed solid back, and an outsideprotecting-casing, to he so applied to a door that the latch or catchcannot be moved without sounding the alarm.

It is illustrated in the following drawings, which represent theinvention in full size, and in which-- Figure 1 is a front view of theinvention; Fig. 2, a back view, showing the form of'backprotecting-plate; Fig. 3, an interior view with the back plate removed,showing the operating mechanism, and Fig. at a sectional rear view ofthe lower part of the same.

Like letters represent like parts in the several views.

A is a casing cast in one piece, the upper part, a, being open circularwork surrounding the bell, and the lower part, c being formed flat andsquare, and provided with a suitable opening for insertion of thespindle B. upper part of the casing, a, is made with openwork, as shown,to protect the bell from being reached or tampered with or manipulatedin any way from the outer side of the door, and also to give the same anexterior neat and attractive appearance.

O is a plate screwed into the back of the case and formed of chilledsteel, to protect the works from access, being bored into, or otherwisetampered with by burglars.

The device is applied to the door by means of screws inserted throughholes 1 and 2.

The

(ModeL) D is a swingingframe, having lugs 3 and 4, to which are pivotedarms d (P. The said arms are held at their upper ends on pins 5 6,projecting from the inner side of the case. The

frame D is also provided with shoulders 9 and 10. The spindle-tumbler Bis provided with arms 7 and 8, which areintended to bear againstshoulders 9 and 10 when the latch is turned, as hereinafter described.

E is a swinging plate, lying next to the casing, and provided at itscenter with a hole to admitof the passage of the spindle of tumbler B.The plate E is pivoted to the swinging frame B at a point, e, by meansof a pin working in a vertically-formed slot in plate E at that pointand provided with a ratchet, a The swinging frame D is held between thearms 7 and 8 of tumbler B and the plate E.

F is a dog used to set the alarm from operating, and turns loosely onpin 11, projecting from the bottom and inner side of the case, and isprovided with a thumb-piece, f, projecting th rough the casingandoperating against notch f on lug 3 of frame D.

G is a side spring, its upper end wound around pin and its lower endbearing on projecting pin 13 on lug 3 of swinging plate D.

H is a spiral spring, attached to pin 6, extending up through hanger (Zand its upper end attached to arm i of lever I. The lever I swings onpin 2', and is provided with beveled spring-catch i which slides at theproper time, as hereinafter described, into notches in ratchet 0 The armi bears against projecting pin i when the alarm is at rest.

K is a bell-hammer, attached to arm 1 of lever I, and strikes againstbell M.

L is a dog on one side of easing, (shown in dotted lines,) which may beused as a substitute for dog F in setting the alarm, and provided withlug 1, arranged to work in recess l Suflicient space is to beallowed inthe easing for operation of dog L.

The operation of the device is as follows: On turning the knob-spindleeither way, one of the arms, 7or8, of the tumbler Bis pressed againstone ofthe'shoulders, 9 or 10, of the swinging frame D, which pressureforces the ratchet 0 against the spring-catch iiwhich in turn throws thepivoted bell-hammer lever I either in or out. As the catch i descendsinto each notch ot' the ratchet the action of spiral spring 11 serves tothrow the bell-hammer against the hell M, giving the alarm. The springG, hearing against the pin 13 on swinging frame D, serves to force theratchet back to its normal position after the knob is turned. The catcht sliding up over the notches, permits the ratchet to swing-back withoutringing the bell. When it is desired to set the alarm so that it shallnot sound the spindle is turned until the last notch in the ratchet ispassed, when, by means of the thumb-piece f, the tongue 1d of dog F isforced into notch f of swinging frame 1), and holds the latter so thatit is not operated by the turning of the knob-spindle.

It will be seen that by the use of dog F the whole number of notcheswill have to be passed in order to set the alarm from ringing, and thatthe alarm cannot be so set without first ringing the bell. To obviatethis, it desired, and also to provide a dog that can be operated to thushold the alarm on doors in which the lock has but a short throw, notadmitting or requiring the whole number of notches to be passed in orderto open the door, we have provided the dog L on one side of the case,(shown in dotted lines in Fig. 3,) and arranged to be attached directlyto arm 71 of the bell-lever I. By pushing this dog in the bellisforeed'back, as also shown in dotted lines, and there held by meansotthe projection l, resting in a recess, Z

Among the advantages possessed by our improvement are simplicity,cheapness, and d urability of construction, ease and rapidity ofadjustment, adaptability to every form of door, certainty of operationwhenever a door is attempted to be opened, and security against be- 1.The combination, in a burglar-alarm, ot-

the swinging frame 1), tumbler B, the plate E, pivoted to frame D andprovided with ratchet c and the dog and the thumb-piece F f, sulstantially as and for the purpose described.

2. The combination of the knob-spindle, the

spindle-tumbler, the ra'itchet-plz'ite, and the swinging frame withbell-lever and bell-hammer, whereby on turning the knob either way thealarm is made to sound, substantially as described.

The combination of the ratchet-frame pi voted to the swinging frame, thespindle-tumbler, the swinging frame located between said tumbler andratchet-frame, and suitable operating mechanism, substantially asdescribed. 4. In aburglar-alarin,the combination ot'the swinging frame,the side hangers, and the belllever with suitable iutern'iediateconnection with swinging frame and the spindle-tumbler, substantially asdescribed.

In testimony whereof we atfix our signatures in presence of twowitnesses.

MABOELLUS DECKER. JAMES K. DEMING. \Vitnesses for Marcellus Decker:

Rom. G'REENHALGII, WILLIAM F. UAnuoLL. \Vitnesses for James K. Deming:

E. D. TowN, JNO. 1t. YOUNG.

